WU-LAN, ZENG, et al. “Synthesis and Crystal Structure of 3-(1H-Benzotriazolyl)- 1-(4-Nitrophenyl)-1-Oxopropan-2-Yl-4-Ethylbenzoate”. Asian Journal of Chemistry, vol. 21, no. 4, Mar. 2010, pp. 2653-8, https://asianpubs.org/index.php/ajchem/article/view/12464.